Index: install.sh
===================================================================
--- install.sh
+++ install.sh	2012-01-12 10:00:56.014787054 +0100
@@ -24,9 +24,10 @@
 MAN_DIR=${MAN_DIR-"$INSTALL_ROOT"/share/man}
 INFO_DIR=${INFO_DIR-"$INSTALL_ROOT"/share/info}
 DOC_DIR=${DOC_DIR-"$INSTALL_ROOT"/share/doc/sbcl}
+LIB_DIR=${LIB_DIR-$INSTALL_ROOT/lib}
 
 # Does the environment look sane?
-if [ -n "$SBCL_HOME" -a "$INSTALL_ROOT/lib/sbcl" != "$SBCL_HOME" ];then
+if [ -n "$SBCL_HOME" -a "$LIB_DIR/sbcl" != "$SBCL_HOME" ];then
    echo SBCL_HOME environment variable is set, and conflicts with INSTALL_ROOT.
    echo Aborting installation.  Unset one or reset the other, then try again
    echo INSTALL_ROOT="$INSTALL_ROOT"
@@ -47,10 +48,10 @@
     exit 1
 fi
 
-SBCL_HOME="$INSTALL_ROOT"/lib/sbcl
+SBCL_HOME="$LIB_DIR"/sbcl
 export SBCL_HOME INSTALL_ROOT
 ensure_dirs "$BUILD_ROOT$INSTALL_ROOT" "$BUILD_ROOT$INSTALL_ROOT"/bin \
-    "$BUILD_ROOT$INSTALL_ROOT"/lib  \
+    "$BUILD_ROOT$LIB_DIR" \
     "$BUILD_ROOT$MAN_DIR" "$BUILD_ROOT$MAN_DIR"/man1 \
     "$BUILD_ROOT$INFO_DIR" "$BUILD_ROOT$DOC_DIR" \
     "$BUILD_ROOT$DOC_DIR"/html \
@@ -90,7 +91,7 @@
 echo
 echo "SBCL has been installed:"
 echo " binary $BUILD_ROOT$INSTALL_ROOT/bin/$RUNTIME"
-echo " core and contribs in $BUILD_ROOT$INSTALL_ROOT/lib/sbcl/"
+echo " core and contribs in $BUILD_ROOT$LIB_DIR/sbcl/"
 
 # Installing manual & misc bits of documentation
 #